Two-cycle internal combustion engine



April 11, 1944 c 5, BROWN 7 2,346,297

TWO CYCLE INTERNAL COMBUSTION ENGINE Filed Aug. 27, 1942 3 Sheets-Sheet 1 AUTO/FAIL" Y5.

Aprifi 11, 1944. Q 5 BROWN 2,346,207

TWO CYCLE INTERNAL COMBUSTION ENGINE Filed Aug. 27, 1942 3 Sheets-Sheet 2 5/7 FNEYS.

April 11, 1944.-

C. 8. BROWN TWO CYCLE INTERNAL COMBUSTION ENGINE Filed Aug. 27, 1942 3 Sheets-Sheet 3 INVENTOR. az m/ flflfl NEYS.

Patented Apr. 11, 1944 OFFICE TWO-CYCLE INTERNAL COMBUSTION ENGINE Charles S. Brown, Syracuse, N. Y. Application August 27, 1942, Serial No. 456,374

6 Claims.

This invention relates to two cycle internal combustion engines, and has for its object an arrangement of the intake and exhaust ports, whereby a maximum amount of fuel mixture can, upon each stroke, be forced into the cylinder with a maximum amount of exploded mixture from the preceding cycle scavenged, so that there is a minimum of combusted charge left in the cylinder at the end of the scavenging stroke.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed. a

In describing this invention, reference is had to the accompanying drawings in whichlike characters designate corresponding parts in all the views.

Figure 1 is a vertical sectional view through one cylinder of an engine embodying this invention.

Figures 2 and 3 are opposite side elevations,

Figure 2 being partly broken away.

Figure 4 is a sectional view on line 4-4, Figure ing .5, and 6 is a connecting rod connecting each power piston 3, and a main crankshaft crank pin 4 on the main crankshaft 4. The cylinder is also formed with a jacketed cylinder head I. The cylinder head I is formed with a piston valve passage 8 thereth'rough in which works a piston valve 9, this being actuated by an overhead piston valve eccentric shaft l0 having eccentrics I I thereon embraced by eccentric straps I2 having eccentric rods as [3 pivoted with the piston valve pin I4 to the piston valve 9. The piston valve eccentric shaft in is suitably mounted in an eccentric shaft casing l5 mounted on the cylinder head I.

I6 designates an intake charge port, and I1 an auxiliary exhaust gas port, these being formed in the head of the cylinder and opening into the piston valve passage 8. They are here shown as opening into the pistontvalve passage 8 at diametrically opposite points, and as extending through sides of the cylinder head 1. These ports are so located that the intake charge port I6 is opened in advance of opening of the auxiliary exhaust gas 'port I1, and hence closed after the auxiliary exhaust gas port I"! is closed, nd both being fully open at the sametime. As here illustrated, the

ports l6, H are arranged in axial alinement on a cleaner 2| on its intake charge air intake.

opposite sides of the piston valve passage 8 but the intake charge port 16 is of larger diameter than the auxiliary exhaust gas port l1.

l8 designates main exhaust gas port located in position to be uncovered by the power piston 3,

when at the end of its power stroke. In some types of engines, ports located as the main exhaust gas port I8 is located, are referred to as auxiliary gas exhausts. In this engine, however, the port I8 is the main exhaust gas port as compared with the capacity of the port ll which, in this case, is the auxiliary exhaust gas port instead of the main exhaust gas port I 8.

l9 designates an-intake charge manifold communicating with the intake charge port I 6 of the cylinder block, this communicating with a carburetor 20 which may have an intake charge air The fuel mixture is forced or supercharged into the intake charge manifold l9 and through the inintake charge pipe 22 respectively, and intermeshing gearlike elements, blower vane driver 26 and driven blower vane 21 in the casing, one gear element being mounted upon an extension, blower vane driver shaft 28, of the main crankshaft, or on another shaft actuated by the main crankshaft. The piston valve eccentric shaft I0 is actuated from the main crankshaft by a piston valve eccentric shaft drive chain 29 running over sprockets on the eccentric shaft and on the main crankshaft.

30 designates the auxiliary exhaust gas manifold for the auxiliary exhaust gas port 11, and 3| is the main exhaust gas manifold for the main exhaust gas port |8. The auxiliary exhaust gas manifold 30 is connected to the main exhaust gas pipe 32 leading from one of the main exhaust gas manifolds 3| so that the exhaust gas from the auxiliary exhaust gas manifold 38 siphons into the main exhaust gas pipe 32 or is drawn out of the auxiliary exhaust gas manifold 30 into the main exhaust gas pipe 32 by the action of the exhaust gases from one of the main exhaust gas 'manifolds 3| acting through the main exhaust gas pipe 32. As here shown, an auxiliary exhaust gas pipe 33 leading from the auxiliary exhaust the incoming combustible charge does not mix to an appreciable extent with the combusted charge exhausting out through the auxiliary exhaust gas port IT.

The compressed charge, which has entered the cylinder through the intake charge port I6, is

ignited by a suitable electric ignition spark plug.

In operation, with the engine started, an explosive mixture is drawn through the carburetor and forced into the intake charge manifold l9 under the action of the intake charge blower or supercharger 23. 7

When the piston valve 9 uncovers the intake charge port It and slightly thereafter, the auxiliary exhaustgas port 11, at which time the piston is at the end of its power stroke and has uncovered the main exhaust gas port, the charge passes under the pressure of the intake charge blower or supercharger 23 through the intake: charge port H5 into thecylinder through the now open piston valve passage 8 and is directed by the piston valve deflector'ifi inwardly. While the greater part of theexhaust gas has already passed out through the main exhaust gas portll8, the'intake charge now forces the remainingexhaust gas out through the auxiliary exhaustgas port I? being facilitated inits passage through the auxiliary exhaust gas port I! by the incoming charge under pressure, andby the suction created in the main exhaust gas pipe 32 on the auxiliary exhaust gas Sylphon 34. The opening of the intake charge port IS in advance of the closing of the main exhaust gas port 18 is the same as the advance given the openings of intake charge'ports Iii on all-modern gas engines over the exhaust gasports to insure more complete charging of the cylinders with combustible ingredients' i What I claim is:

1. In a two cycle internal combustion engine including a cylinder, a piston in the cylinder, a crankshaft, and a connecting rod between the piston and the crankshaft; the combination of the head of the cylinder being formed with a valve passage, intake and auxiliary exhaust gas ports opening into said passage, and a piston valve arranged to open and close said ports, with both ports being open and closed at the same time, and with said ports arranged so that the inta'keportis opened before the auxiliary exhaust gas port and closed after the auxiliary exhaust gas port closes, the piston valve having a deflector located to deflect the incoming intake charge into the cylinder in a direction opposite to the path of the auxiliary exhaust gas to the auxiliary exhaust gas port, the cylinder also having main exhaust gas ports arranged to be opened when the piston approaches the end of its power stroke, and mechanism for supplying a motive vapor 'under pressure to the intake port and for operating the piston valve.

2. In a two cycle internal combustion engine including a cylinder, a piston in the cylinder, a crankshaft, and a connecting rod between the piston and the crankshaft; the combination of the head of the cylinder being formed with a valve passage, intake and auxiliary exhaust gas ports opening into said passage, and a piston valve arranged to open and close said ports, with both ports being open and closed at the same time, and with said ports arranged so that the intake port is opened before the auxiliary exhaust gas port and closed after the auxiliary gas port closes, the piston valvehaving a deflector located to deflect the incoming intake charge into the cylinder in a direction opposite to the path of the auxiliary exhaust gas through the auxiliary exhaust gas port, the cylinder also having main exhaust gas ports arranged to be opened when the piston approaches the end of its power stroke, mechanism-for supplying a motive vapor under 1 pressure to the intake port and for operating the piston valve, and means to draw the auxiliary exhaust gas through the auxiliary exhaust gas port controlled by the piston valve.

3. In a two cycle internal combustion engine including a cylinder, a piston in the cylinder, :1 crankshaft, and a connecting rod between the piston and the crankshaft; the combination of the head Q? the cylinder being formed with a valve passage, intake and auxiliary exhaust ports opening into said passage, and a piston valve arranged to open and close said ports, with both portsbeing open and closed at the same time, and with said ports arranged so that the intake port is opened before the auxiliary exhaust gas port and closed after the auxiliary exhaust gas port closes-the piston valve having a deflector located to deflect the incoming intake charge into the cylinder in a direction opposite to the path of theauxiliary exhaust gas to the auxiliary exhaust gas port, the cylinder also having main exhaust gas ports arranged to be opened when the piston approaches the end of its power stroke, intakeand exhaust manifolds, the auxiliary exhaust gas manifold for the auxiliary exhaust gas port in the headof the cylinder being connected to the main exhaust gas pipe and being provided with a nozzle in the main exhaust gas pipe operating to efiectsuction through the auxiliary exhaust gas port controlled by the piston valve,

andymeans for-operating the piston valve.

4.-I n a two cycle internal combustion engine including a cylinder, a piston in the cylinder, a crankshaft, and a connecting rod between the 0 arranged so that the intake port is open before the auxiliary exhaust gas port and closed after the auxiliary exhaust gas port closes, the piston valyehaving a deflector located to deflect the incomingintake charge into the cylinder in a direction oppositeto the path of the auxiliary exhaust gasto the auxiliary. exhaust gas port, the cylinder also having main exhaust gas. ports arranged to be opened when the piston approaches theend-of its power stroke, means for operating the piston valve, and means for forcing a fuel vapor mixture through the intake port.

5. In a two cycle internal combustion engine including a cylinder, a piston in the cylinder, a crankshaft, andgaconnecting rod between the pistonand the crankshaft; the combination of the head-of the cylinder being formed with a valve passaga intake and auxiliary exhaust ports opening iinto said passage, and a piston valve arranged to open and close said ports, with both ports being open and closed at the same time, and with said ports arranged so that the intake port is open before the auxiliary exhaust gas port and closed after the auxiliary exhaust gas port closes, the piston valve having a deflector located to deflect the incoming charge into the cylinder in a direction opposite to the path of the auxiliary exhaust gas to the auxiliary exhaust gas port, the cylinder also having main exhaust gas ports arranged to be opened when the piston approaches the end of its power stroke, means for operating the piston valve, means for forcing a fuel vapor mixture through the intake port,

and means for creating suction in the auxiliary exhaust gas port controlled by the piston valves 6. In a two cycle internal combustion engine including a cylinder, a piston in the cylinder, a crankshaft, and a connecting rod between the piston and the crankshaft; the combination of the head of the cylinder being formed with a valve passage, intake and auxiliary exhaust ports opening into said passage, and a piston valve arranged to open and close said ports, with both ports being open and closed at'the same time, and with said ports arranged so that the intake port is open before the auxiliary exhaust gas port and closed after the auxiliary exhaust gas port closes, the piston valve having a deflector located to deflect the incoming intake charge into the cylinder in a direction opposite to the path of the auxiliary exhaust gas to said auxiliary exhaust passage, the cylinder also having main exhaust gas ports arranged to be opened when the piston approaches the end of its power stroke, intake main exhaust and auxiliary exhaust gas manifolds, the auxiliary exhaust gas pipe from the auxiliary exhaust gas manifold for the auxiliary exhaust gas port in the head of the cylinder being connected to the main exhaust gas pipe and being provided with a nozzle in the main exhaust gas pipe operating to efiect suction on the auxiliary exhaust through the auxiliary exhaust gas port in the head of the cylinder, means for operating the piston valve,

and means for forcing a fuel vapor mixture through the intake port.

CHARLES S. BROWN. 

